Render spherical tiles with standard web mercator mapping

[tentone]

Summary

• add a Web Mercator aware MapSphereNodeGeometry that keeps spherical nodes aligned with square tiles
• switch MapSphereNode to standard MeshBasicMaterial-based texturing driven by the shared tile loader
• rebuild distributed bundles and type declarations

Testing

• npm run build

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https://chatgpt.com/codex/tasks/task_e_68f5198dd7bc8332b4b55ba7e1478848

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